Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in
1. C3 -plants
2. C4 -plants
3. C2 -plants
4. C3 and C4 -plants

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 75%
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Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening, carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of the following options.
1. Both process can happen together because the diffusion coefficients of water and CO2 are different.
2. The above processes happen only during night time
3. One process occurs during the day time and the other occurs at night
4. Both processes cannot happen simultaneously

Subtopic:  Factors Affecting Photosynthesis |
 71%
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A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

1. C4 2. CAM
3. Nitrogen-fixer 4. C3
Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 81%
From NCERT
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Emerson's enhancement effect and red drop have been instrumental in the discovery of
1. two photosystems operating simultaneously
2. photophosphorylation and cyclic electron transport
3. Oxidative phosphorylation
4. photophosphorylation and non-cyclic electron transport

Subtopic:  Emerson's Enhancement Experiment |
 70%
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In a chloroplast the highest number of protons are found in

1.lumen of thylakoids2.inter membrane space
3.antenna complex4.stroma
Subtopic:  Chemiosmotic hypothesis |
 84%
From NCERT
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The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements are involved in this reaction?
1. Manganese and chlorine
2. Manganese and potassium
3. Manganese and molybdenum
4. Manganese and calcium

Subtopic:  Light Reactions |
 74%

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In photosynthesis, the light-independent reactions take place at

1. thylakoid lumen 2. photosystem l
3. photosystem ll 4. stromal matrix
Subtopic:  Dark Reaction: Biosynthetic Phase |
 69%
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The structures that are formed by stacking of organised flattened membranous sacs in the chloroplasts are

1.cristae2.grana
3.stroma lamellae4.stroma
Subtopic:  Chloroplast Structure |
 86%
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Anoxygenic photosynthesis is characteristic of
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva

Subtopic:  Introduction |
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The correct sequence of cell organelles during photorespiration is
1. chloroplast-golgi bodies-mitochondria
2. chloroplast-rough endoplasmic reticulum-dictyosomes
3. chloroplast-peroxisome-mitochondria
4. chloroplast-vacuole-peroxisome

Subtopic:  Photorespiration |
 83%

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